Bluetooth version: V5.1+EDR <br> <br> Wireless frequency: 2.4GHZ <br> <br> Supported protocols: A2DP1.3/HFP1.6/HSP1.2/AVRCP1.6/D11.3 <br> <br> Transmission distance: 10 meters <br> <br> Battery capacity: 180mAh <br> <br> Charging voltage/current: 5V/1A <br> <br> Play/talk time: about 16 hours <br> <br> Charging time: about 2 hours <br> <br> Standby time: 300 hours <br> <br> Speaker impedance: &phi;8mm 32&Omega; <br> <br> Microphone sensitivity: -42Db <br> <br> Working temperature: -10-50℃ <br> <br> Full set weight: 102g <br> <br> Specifications: <br> <br> 1. It is inaudible, safer to exercise, and can hear external sounds at any time <br> <br> 2. The air conduction does not enter the ear, which will not hurt the ear. It is safer and more comfortable to wear for a long time <br> <br> 3.18 hours of strong endurance, 120 days of super long standby, go to sports at will, and keep music <br> <br> 4. Life class waterproof, no fear of wind, rain and cold to prevent damage to the device by sweat and rain <br> <br> 5. Low power consumption 5.2 chip, strong signal, one second connection, more stable listening and talking. <br> <br> Package Included: <br> <br> 1*Headphone <br> <br> 1*Charging cable <br> <br> 1*User Manual